Re: [PATCH] drm: rcar-du: Replace drm_driver GEM ops with GEM object functions

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Noralf,

On Tue, Jun 18, 2019 at 03:56:19PM +0200, Noralf Trønnes wrote:
> Den 18.06.2019 15.13, skrev Laurent Pinchart:
> > The recommended way to specify GEM object functions is to provide a
> > drm_gem_object_funcs structure instance and set the GEM object to point
> > to it. The drm_cma_gem_create_object_default_funcs() function provided
> > by the GEM CMA helper does so when creating the GEM object, simplifying
> > the driver implementation. Switch to it, and remove the then unneeded
> > GEM-related opertions from rcar_du_driver.
> 
> s/opertions/operations/

Oops, will fix.

> > Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> > ---
> >  drivers/gpu/drm/rcar-du/rcar_du_drv.c | 8 +-------
> >  1 file changed, 1 insertion(+), 7 deletions(-)
> > 
> > Daniel, is this what you had in mind ?
> > 
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > index 3e5e835ea2b6..4cbb82009931 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > @@ -445,16 +445,10 @@ DEFINE_DRM_GEM_CMA_FOPS(rcar_du_fops);
> >  static struct drm_driver rcar_du_driver = {
> >  	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME
> >  				| DRIVER_ATOMIC,
> > -	.gem_free_object_unlocked = drm_gem_cma_free_object,
> > -	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> > +	.gem_create_object      = drm_cma_gem_create_object_default_funcs,
> >  	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> >  	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> > -	.gem_prime_import	= drm_gem_prime_import,
> > -	.gem_prime_export	= drm_gem_prime_export,
> > -	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
> >  	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> > -	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
> > -	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
> >  	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
> 
> If you want to pick up yet another recommendation, you can use
> drm_gem_prime_mmap here.

I compared the two call stacks and they appear similar, even if
drm_gem_prime_mmap() leads to a more convoluted code flow. For my
information, what's the advantage in using it ?

> Either way:
> 
> Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
> 
> >  	.dumb_create		= rcar_du_dumb_create,
> >  	.fops			= &rcar_du_fops,

-- 
Regards,

Laurent Pinchart
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